He is one of their best players and is playing each season better and better. Now with Sterling gone he will have a lot of space and time to play more in their games. So i think he made the right choice to extend his contract and this is good for both Mahrez and Man City.
Mahrez game and way of playing really attracted Pep Guardiola interest to stay with him for the next 2 seasons. Mahrez last season really made a big contribution to what Manchester City has achieved. From last season's record, Mahrez performed well with Manchester City, both in the domestic league and in the Champions League, he is really needed by Manchester City, especially after losing Raheem Sterling, I think he will get more playing minutes next season. Mahrez is the best pass for Haaland in the next season and we can see both of them in action next season, will both of them really look stunning as expected by pep guardiola.